package org.protobuf.chapter2;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender;

/**
 * 
 * @Description	SubReqClient
 * @ClassName	SubReqClient
 * @Date		2018年1月16日 下午1:37:41
 * @Author		liangjl
 * @Copyright (c) All Rights Reserved, 2018.
 */
public class SubReqClient {

	public void connect(int port, String host) throws Exception {
		// 配置客户端NIO线程组
		EventLoopGroup group = new NioEventLoopGroup();
		try {
			Bootstrap b = new Bootstrap();
			b.group(group).channel(NioSocketChannel.class).option(ChannelOption.TCP_NODELAY, true)
					.handler(new ChannelInitializer<SocketChannel>() {
						@Override
						public void initChannel(SocketChannel ch) throws Exception {
							ch.pipeline().addLast(new ProtobufVarint32FrameDecoder());
							ch.pipeline().addLast(new ProtobufDecoder(SubscribeRespProto.SubscribeResp.getDefaultInstance()));
							ch.pipeline().addLast(new ProtobufVarint32LengthFieldPrepender());
							ch.pipeline().addLast(new ProtobufEncoder());
							ch.pipeline().addLast(new SubReqClientHandler());
						}
					});

			// 发起异步连接操作
			ChannelFuture f = b.connect(host, port).sync();

			// 当代客户端链路关闭
			f.channel().closeFuture().sync();
		} finally {
			// 优雅退出，释放NIO线程组
			group.shutdownGracefully();
		}
	}

	/**
	 * @param args
	 * @throws Exception
	 */
	public static void main(String[] args) throws Exception {
		int port = 8080;
		if (args != null && args.length > 0) {
			try {
				port = Integer.valueOf(args[0]);
			} catch (NumberFormatException e) {
				// 采用默认值
			}
		}
		new SubReqClient().connect(port, "127.0.0.1");
	}
}